UV-Stabilizers are very useful additive for engineering thermoplastics. Since 1164, goes through well studies ESIPT (excited state intramolecular proton transfer) where as 3638 do not have adjacent -OH group to go through this mechanism. Please see attached structure and uv absorption profile. 3638 shows fluorescence where as 1164 is very very little. Any suggestion on understanding the working mechanism of 3638 will be highly appreciated.
Thanks,
Hi Hammad. As far as I understand, UV-stabilizers usually involve fast deactivation back to the ground state. If 3638 shows fluorescence, it doesn't seem to fit to the catergory?
Chao, thanks for pointing out very important aspect. 3638 do have much stronger fluorescence compared to 1164 (attached). 3638 is very close to be mirror image of absorption profile, thus showing discrete and will defined orbital structure whereas 1164 show structure less emission.
Has 3638 been proven to be a suitable UV-stabilizer? Or is the question more about the different photophysical properties of the two molecules?
Please see the links below, 3638 is a commercial UV-Stabilizer,
http://cytec.com/products/cyasorb-uv-3638f
http://www.wanchem.com.cn/products/UV_3638.html
Hmm~ then maybe it's stable and easy to synthesize?? Also by linking two benzoxazinone units together, the absorption is effectively doubled?
Hi Hammad, I know this is not an answer or related to your question, but is there a work that I can cite the fluorescence emission of 3638 you showed?
Hi Hammad & Lin, How these uv stabilizer works? I want to know the reaction mechanism.
- Badges
- Science method
- Similar topics
- Methodology
- Absorption Spectroscopy
- UV-Visible Spectroscopy